.playBtn {
  position: fixed;
  right: 50px;
  top: 50px;
  height: 50px;
  width: 50px;
  border: 2px solid #abcec79e;
  border-radius: 50%;
  background: url(../img/play_btn.png) center/72px 72px
    no-repeat transparent;
  cursor: pointer;
  animation: turn 3s ease-in-out infinite;
}

.playBtn_stopturn {
  animation: none;
}

@keyframes turn {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }

  /*0%{-webkit-transform:rotate(0deg);}
            25%{-webkit-transform:rotate(90deg);}
            50%{-webkit-transform:rotate(180deg);}
            75%{-webkit-transform:rotate(270deg);}
            100%{-webkit-transform:rotate(360deg);}*/
}
